keep out（使）留在外面；扣留；保留，留出；
例如He was trying to keep out of the birds line of sight.
Peg down netting over the top to keep out leaves.
用销钉在顶上加固防护网，防止叶子落入。
She stamped her feet on the pavement to keep out the cold.
她在人行道上跺着双脚取暖。
Keep out of mischief.
不要顽皮。
